Why is believing in Christ’s finished work important for Christians?

Believing in Christ's finished work is crucial for Christians as it underpins our justification and assurance of salvation. In Ephesians 2:8-9, Paul asserts that it is by grace we are saved through faith, not by works, thereby ensuring that no one can boast. Relying solely on Christ's work emphasizes that our acceptance before God is based entirely on His mercy and grace. This belief liberates believers from the fear of losing salvation due to human failure, as it acknowledges that our standing before God is secure in the completed work of Christ, which is unchangeable and eternal. Additionally, it informs our daily Christian living, pushing us to respond in grateful obedience rather than striving for acceptance through works.